“…In Kr and Xe many-body effects, which are connected to the polarizability of the system, are expected to be more pronounced. This has been actually confirmed in further experiments carried out at 297 K and several low densities in gaseous Kr (Formisano, Benmore, Bafile, Barocchi, Egelstaff, Magli & Verkerk, 1997, Benmore, Formisano, Magli, Bafile, Verkerk, Egelstaff & Barocchi, 1999 and Xe (Formisano, Barocchi & Magli, 1998). In Fig.…”